Three dimensional phytic acid-induced graphene as a solid-phase microextraction fiber coating and its analytical applications for nerolidol in tea

In this work, three dimensional phytic acid-induced graphene coating was prepared by hydrothermal synthesis and fabricated on a stainless-steel wire using physical coating method as a solid phase microextraction (SPME) coating. The graphene coating revealed high specific surface area, extraordinary electrical conductivity and excellent chemical stability. Coupled with gas chromatography-flame ionization detector (GC-FID), the home-made phytic acid-induced graphene SPME fiber exhibited excellent extraction efficiency for the analysis of nerolidol in tea samples. Under the optimized conditions, the linear range of working curve was found to be 1–1000 ng/g, and the limit of detection of nerolidol was 0.18 ng/g. The coefficient variation of repeatability for each single fiber and reproducibility for fiber to fiber was less than 3.9% and 8.3%, respectively.